"Volumes 2 and 3 will contain classified material and will not be available for sale to the public."

v. 1. History, evolution and development of manually operated, full automatic, and power driven aircraft machine guns -- v. 2. History, evolution and development of manual, automatic, and airborne repeating weapons by the Soviet Union and her satellites -- v. 3. Development during World War II and Korean Conflict by the United States and their Allies, of full automatic machine gun systems and high rate of fire power driven cannon -- v. 4. Design analysis of automatic firing mechanisms and related components.